TBF I don't think you can judge Job design by 5.0. They changed design direction in 5.0 and I personally think the reason jobs seem easier after rework as they have adjusted them with future additions to the job in mind. I think though that compressing multiple actions to one button is only really good when You have kit that precludes the use of other things, an example would be summoner. Where you cannot use Ankh Morn, Revelation or Enkindle depending on what phase you are in, therefore it makes sense to compress the buttons into 1. I think for a base combo, as others have said, having them compressed into a base button instills a rigid play style that does not allow you to bend the rotation to the fight. For the most part this is fine, but in Savage, Ultimates and extremes too much rigidity will literally make an optimum play of these classes difficult and clunky if not impossible to do without loosing a lot of combos / GCD. That said, there are ways they could do this in part by compressing the combo finisher into one button as most combos start with the same initial, then have a branching second and a finisher dependant on the second. the finisher could easily be the same button proc'd by whichever second combo skill was used. That would save space, but also keep the combos separate, however it also makes it incredibly difficult to break the combo, so the skill floor of the job would be lowered. (Which isnt necessarily a bad thing)